Directory
? 👈
Inch or
Metric
The main Navigation tabs at top of each page are Metric - inputs in millimeters (mm)
For Inch versions, directly under the main tab is a smaller 'Inch' tab for the Feet and Inch version.
Drop Down Menus have M for Metric Versions.
Help


Home
♻ 		8 Inch Block
Calculator 		200 Series
Block Types 		200 Series
Calculator 		100 Series
Calculator 		Concrete Block
Miter Cuts
Block
Gable Cutting 		Templateless
Arch 		Circular
Block Walls 		Rebar
Map
Inch Inch Inch Inch
Mixer

Build concrete core filled masonry block arches without a template See also: Masonry Arch Header Cut and Placement Calculator



An arch has 2 identical sets of cuts
(left and right sides). A bulls-eye (circle) has 4.

Scale
How it works When the wall is core filled, the membrane (flashing) around the arch line stops the concrete. Remove off-cuts and extra blocks to reveal the arch.

Width
Height In
Cut all the blocks before construction. The cut blocks (all halves) that form the arch are numbered sequentially, with off-cuts numbered identically. Take the opening to spring height, then using a standard horizontal head support, go across the head, laying each cut in its place, its matching off-cut on top, with a membrane (aluminum flashing is ideal) between the two. Lay the cut, place the flashing on top of the cut line and lay the off-cut to lock membrane in place.
Use overlapping lengths of thick, strong (aluminum) flashing about 3 feet long so the flashing doesn't get in your way.


Concrete block arch diagram


Circular Raking Walls with Arch or Bullseye You can combine this Templateless Arch System with the Circular Wall System to easily build curved or circular (and raking) walls with arches or bulls-eyes. It's easy! If you'd like more detailed info on this, please contact us.





DON'T BREATH THE DUST If you're cutting blocks, concrete, stone or ANYTHING and there's DUST - DON'T TAKE THE RISK
Don't cut it, or cut it wet so there's NO DUST - Silicosis Sucks
And if you're cutting wet, wear a mask - theres dust in the spray mist too!

How should we spell it?



Results


Built something using our calculators? Please Send Photos! See examples

Blue Dragon Childrens Foundation If you've benefited from this free service please consider supporting Blue Dragon Children's Foundation



Please help promote this free service - Tell a Friend about this site!

Create PDF to print diagrams on this page. Help Printing Help (new window)

Copy all diagrams on this page to bottom of page - Make multiple copies to Print or Compare.

View page on Phone via QR Code (Not current calculation result)

Directory


?
Click Slider to select then use keyboard cursor keys ◄ ► to fine tune.
Use Keyboard ◄ ►
to Fine tune Sliders

?
Create and Print Full Scale PDFs with diagrams on this page (templates)


?
Copy all diagrams on this page to bottom of page - Make multiple copies to Print or Compare Results





PDF & Printing Help

Help Share

← Remove Margins

Jump to Top ↑

Built something using this site?
Please Send Photos!
See Examples
blocklayer.com calculators

If you've benefited from this free service please consider supporting: Please help us support Blue Dragon Children's Foundation




Inch or Metric? 👈
The main Navigation tabs at top of each page are Metric - inputs in millimeters (mm)
Directly under the main tab is a smaller 'Inch' tab for the Feet and Inch version.
Drop Down Menus have M for Metric Versions.
Metric
Calculator
Inch



Please help promote this free service
Tell a Friend!

Facebook Twitter eMail Pinterest Reddit LinkedIn
Contact Us

blocklayer.com calculators

Real Life Online On-Site Calculators with To Scale and Full Scale Animated Detailed Diagrams and Printable Templates
for all Construction Tasks + Woodwork Metal Work and Craft

All calculators on this site are geometric only.
Check relevant local regulations for appropriate sizes, spacings and all engineering requirements.

Disclaimer   |   Privacy & Cookie Policy

Copyright © 2021 - blocklayer.com
Contact Us